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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <script>
    var arr = [{ label: '男', value: 1 }, { label: '女', value: 0 }]

    // function f(arr) {
    //   // 写代码，得到
    //   let obj = {}
    //   arr.forEach(item => {
    //     obj[item.value] = item.label
    //   })
    //   return obj
    // }

    function f(arr) {
      // 写代码，得到
     const res = arr.reduce((prev, item) => {
       prev[item.value] = item.label
       return prev
      }, {})
      return res
    }
    var obj = f(arr);
    console.log(obj)
 // obj2 = {'1': '男'， '0': '女'}
  </script>
</body>

</html>